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# Polynomial Function

A function f : R â†’ R is said to be polynomial function if for each x in R, y = f(x) = a0 + a1x + a2x2 + ...........+an xn, where n is a non-negative integer and ao, a1, a2, .....anâˆˆ R.

The function f defined by f(x) = x2âˆ€ x Îµ R, is called the square function. Note that its domain is R and range is [0, âˆž). Its graph is given in figure above.